梨大食心虫在延边地区一年发生一代,以初龄幼虫在芽内作白色薄茧越冬。4月中旬越冬幼虫开始破茧而出,为害刚萌动的花芽。据1960年4月18日,1961年4月16日观察前五天日平均气温达12.2—13.5℃,越冬幼虫开始活动。4月下旬至5月上旬,当“苹果梨”花序分离、花丝伸出时,是梨大食心虫为害花芽的盛期。6月上旬,幼果直径达1.6厘米左右时,幼虫即钻入幼果为害。7月上旬开始化蛹(前五天平均气溫为21.8℃),蛹期11—20天,平均15天。7月中旬开始羽化、交尾、产卵,卵期9天。7月下旬到8月上旬,初孵幼虫开始为害梨芽,8月上、中旬为害最盛。9月 Pear boreal worms occur in Yanbian area a year, to the first instar larva in the bud for white thin cocoon wintering. In mid-April overwintering larvae began to break cocoon outbreak, just damaging flower buds. According to April 18, 1960, April 16, 1961 observed the first five days of the average temperature of 12.2-13.5 ℃, overwintering larvae began to move. In late April to early May, when the “apple pear” inflorescence separation, filaments extend, is the pear Pest Insects damage the peak of flower buds. Early June, young fruit diameter of about 1.6 cm, larvae that drill into young fruit damage. In early July pupation (average temperature of the first five days was 21.8 ℃), pupal period of 11-20 days, an average of 15 days. Beginning in mid-July emergence, mating, spawning, oviposit period 9 days. In late July to early August, the newly hatched larvae began to damage the pear buds, and August was the most damaging in the middle. September